Here is the full list of all 30 Dust: An Elysian Tail achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Defeat General Gaius
Complete 20 Sidequests
Fulfill Bopo’s wish for snow
Defeat Baron Kane
Complete all Fale Quests
Defeat Lady Tethys
Kill an enemy with the slide attack
Complete 10 Sidequests
Reign chaos by putting poison ivy into Gianni's laundry
Complete 5 Sidequests
Earn a Four-Star Rating in any Challenge Arena
Unlock a Cage and Rescue a Friend
Craft an item from a blueprint
Meet Haley
Kill 500 Enemies
Defeat Fuse
Successfully complete a 200+ hit combo
Unlock a Treasure Chest
Use the DUST STORM on Fidget's Projectiles
Level Up by Assigning Skill Gems
Pick Up an Ability Orb
Successfully complete a 1000+ hit combo
Hang out with Twelve Friends in the Sanctuary
Earn a Four-Star Rating in EVERY Challenge Arena
Simultaneously Kill 6 Enemies with a Single Bomb
Opt out of putting poison ivy into Gianni's laundry
Successfully Parry with less than 10% health remaining
Bug Matti
Complete the Game on Tough or Hardcore setting
Destroy every enemy Cannon